1. Automatic cut-off function under abnormal working conditions. A pressure upper limit, a lower limit and a pressure drop rate are respectively set for the pneumatic hydraulic ball valve to meet the operation requirements. When the pipe pressure is higher or lower than the upper and lower pressure limits, the ball valve will automatically close. In case of explosion or rupture of the pipeline, the valve will automatically close when the detected pressure drop exceeds the set pressure drop rate.

2. Multiple operating modes. The pneumatic hydraulic ball valve has four operation modes: manual, automatic, pneumatic and remote control. The operation mode can be selected according to the actual operating conditions to improve the safety and reliability of the valve. In manual mode, only need to change different gears and press the hand pump handle to realize the switch operation; In the pneumatic mode, pull the operating handle in the direction of "left open and right close" to complete the opening and closing operation. If the laptop computer is used to set parameters and start the automatic function, the automatic control of the valve can be achieved. If the valve is equipped with a remote control unit (RTU), the remote control of the valve can be realized through remote signal transmission. The Shaanxi Beijing gas transmission pipeline has enabled the remote closing function online.

3. High security. The pneumatic hydraulic ball valve uses high-pressure natural gas or hand pump as the power source, without additional mechanical or electrical equipment, with low accident rate, safety and reliability, and good economy.